This is a great progression of Montessori toys/materials for babies and toddlers, starting at about 10-12 months, and can stay interesting for a long time. They are all packed away in their original boxes which makes them easy to store, so you can get one or two out at a time. Canvas bags come with each work, to hold the smaller pieces. The only items with signs of wear are the Stable Stacker rings. Two missing pieces: one wide ring from the stable stacker and one yellow ball from the Push Balls. There is a yellow ball in the Tracker that could be used in the push balls. Set Includes: Object Permanence Box Push BallStable Stacker First Puzzles Peg Box Tracker Retail is over $300